linux-kernel - Re: [PATCH v2 7/7] spi: spi-fsl-spi: Add support for gpio chipselects for GRLIB type cores

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Date:	Thu, 7 Feb 2013 08:08:21 -0800
From:	Anton Vorontsov <anton@...msg.org>
To:	Andreas Larsson <andreas@...sler.com>
Cc:	Grant Likely <grant.likely@...retlab.ca>,
	Mark Brown <broonie@...nsource.wolfsonmicro.com>,
	spi-devel-general@...ts.sourceforge.net,
	Mingkai Hu <Mingkai.hu@...escale.com>,
	Joakim Tjernlund <Joakim.Tjernlund@...nsmode.se>,
	Kumar Gala <galak@...nel.crashing.org>,
	Peter Korsgaard <jacmet@...site.dk>,
	linux-kernel@...r.kernel.org, software@...sler.com
Subject: Re: [PATCH v2 7/7] spi: spi-fsl-spi: Add support for gpio
 chipselects for GRLIB type cores

On Thu, Feb 07, 2013 at 02:12:11PM +0100, Andreas Larsson wrote:
> This relies upon of_spi_register_master to find out which gpios to use.
> 
> Signed-off-by: Andreas Larsson <andreas@...sler.com>
> ---
>  drivers/spi/spi-fsl-lib.h |    1 +
>  drivers/spi/spi-fsl-spi.c |   53 +++++++++++++++++++++++++++++++++++++++-----
>  2 files changed, 48 insertions(+), 6 deletions(-)

Just a couple of minor nits...

> diff --git a/drivers/spi/spi-fsl-lib.h b/drivers/spi/spi-fsl-lib.h
> index d5c788b..52db693 100644
> --- a/drivers/spi/spi-fsl-lib.h
> +++ b/drivers/spi/spi-fsl-lib.h
> @@ -71,6 +71,7 @@ struct mpc8xxx_spi {
>  
>  #ifdef CONFIG_SPI_FSL_SPI
>  	int type;
> +	int native_chipselects;
>  	u8 max_bits_per_word;
>  
>  	void (*set_shifts)(u32 *rx_shift, u32 *tx_shift,
> diff --git a/drivers/spi/spi-fsl-spi.c b/drivers/spi/spi-fsl-spi.c
> index 55652e6..2befe16 100644
> --- a/drivers/spi/spi-fsl-spi.c
> +++ b/drivers/spi/spi-fsl-spi.c
> @@ -418,7 +418,7 @@ static int fsl_spi_setup(struct spi_device *spi)
>  {
>  	struct mpc8xxx_spi *mpc8xxx_spi;
>  	struct fsl_spi_reg *reg_base;
> -	int retval;
> +	int retval, desel;

We don't usually place variable declarations on the same line, unless the
variables are closely related.

>  	u32 hw_mode;
>  	struct spi_mpc8xxx_cs	*cs = spi->controller_state;
>  
> @@ -456,12 +456,45 @@ static int fsl_spi_setup(struct spi_device *spi)
>  		return retval;
>  	}
>  
> +	if (mpc8xxx_spi->type == TYPE_GRLIB) {
> +		if (gpio_is_valid(spi->cs_gpio)) {

<- You can place the 'int desel;' here, limiting the visibility for it.

> +			retval = gpio_request(spi->cs_gpio,
> +					      dev_name(&spi->dev));
> +			if (retval)
> +				return retval;
> +
> +			desel = !(spi->mode & SPI_CS_HIGH);
> +			desel ^= !!(spi->cs_gpio_flags & OF_GPIO_ACTIVE_LOW);
> +			retval = gpio_direction_output(spi->cs_gpio, desel);
> +			if (retval) {
> +				gpio_free(spi->cs_gpio);
> +				return retval;
> +			}

Thanks,
Anton
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